Intake And Exhaust Ports; Engine Block - Honda GX160 Tech Manual

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Measure from surface of head to lowest machined area in the bowl of the port. This dimension will be:

D. Thickness of head. This will be measured from valve cover surface to head gasket surface at the side

at a position in line with upper intake & exhaust flange bolt.

INTAKE AND EXHAUST PORTS

Ports will be "as cast" and in factory machined condition and there must be no addition or subtraction of

metal or any other substance to the inside or outside of the cylinder head.

B. No alterations of any kind to be made to the intake or exhaust port.

C. This includes any grinding, polishing, etching, sand blasting or glass beading to interior surface.

D. Valve seats must be a stock single 45 degree angle. Multi angle valve seats are not permitted. Value

seats must not be replaced.

E. Intake and Exhaust ports at valve:

Exhaust: maximum 0.869" minimum 0.858"

This engine block must be "as cast" and in factory machined condition. There must be no addition

or subtraction of metal or any other substance to the inside or outside of the cylinder block, crankcase

cover, crankshaft, rod, piston, pin, rings, flywheel or coil with the following exceptions:

Removal of rear gas tanks brackets is permitted.

Removal of governor. Governor system may be partially removed with the exception of the steel gear on the crankshaft.

This gear must remain intact. Governor arm and shaft may be removed, tied forward or altered to accommodate throttle

linkage or return springs.

Addition of brackets, fittings etc. to accommodate throttle linkage, tachometer, temperature gauge is allowed.

Intake:

1.062 - 1.170" maximum

Exhaust: 1.103 - 1.122" maximum

Maximum 2.917"

Minimum 2.911" Thailand heads 2.904"

Intake: maximum 0.915" minimum 0.900"

Check bore:

2.682" maximum

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